chore: bump ccxt to 4.4.43

this adds support for myokx, the OKX EAA subsidiary.

Author: xmatthias

requirements.txt

@@ -4,7 +4,7 @@ bottleneck==1.4.2
 numexpr==2.10.2
 pandas-ta==0.3.14b
 
-ccxt==4.4.42
+ccxt==4.4.43
 cryptography==42.0.8; platform_machine == 'armv7l'
 cryptography==44.0.0; platform_machine != 'armv7l'
 aiohttp==3.10.11